Screw-cutting die.



PATENTED NOV .24, 1903. M. R. MOBEGK. I

SCREW CUTTING DIE. APPLIOATION FILED JAN. 19,.190a

N0 MODEL.

UNITED STATES Fatented November 24, 1903.

MARTIN R. MOBEOK, OF CHICAGO, ILLINOIS.

sQREw CUTTlNG DIE.

SPECIFICATION forming part of Letters Patent No. 745,222, dated November24, 1903.

Application filed January 19, 1903. Serial No. 139,555. (No model.)

To all whom it may concern:

Be it known that l, MARTIN R. MOBEOK, a citizen of the United States, residing at Ohi cago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Screw-Cutting Dies,of which the following is a full, clear, and exact specification.

My invention relates more particularly to dies for cutting wooden screws or screws composed of other comparatively soft material; and it has for its primary object to provide an improved form of divided die capable of being readily thrown open to release the work without having to back the screw out or to run the stick entirely through the die.

With these ends in view my invention consists in certain features of novelty in the construction, combination, andarrangement of parts by which the said objects and certain other objects hereinafter appearing are-attained, all as fully described with reference to the accompanying drawings and more particularly pointed out in the claims.

In the said drawings, Figure l is a plan view of my improved die, showing the same in the act of cutting a screw. Fig. 2 is aside view thereof looking from the section-line 2 2, Fig. 1. Fig. 3 is a similar view looking from the section-line 3 3, Fig. 1. Fig. 4 is a crosssection on the line 4 4, Fig. 2. Fig. 5 is an A 'end view with the top section of the die broken away, and Fig. 6 is adetail of the latch-lever.

The body of the die is composed of two sections 1 2, hinged together, as shown at 3, at one side and adapted to fit together, so that the semicylindrical passages of the two sections will constitute a cylindrical passage for the stick 4 on which the threads 5 are to be cut.

The side of the body opposite the hinge 3 is provided with some suitable means of securing the sections 1 2 together. As an example and very desirable formof such means I have shown the upper or outer section 1 provided with a pair of ears 6, between which is pivoted on a pin 7 the upper end of a locking-lever 8, which is provided with an aperture 9, adapted to fit over a beveled or camshaped lug 10, formed on the lower section 2, when the lever 8 is thrown downwardly and pressed inwardly, the free end of the lever being provided withathu mb-piece 11, whereby the thumb of the operator may be pushed under it for readily throwing the sections 1 2 open the instant the thread reaches the desired or predetermined length in the stick.

The interior of each of the sections 1 2 is provided with screw-threads 12 at one end of the body portion for engaging and feeding the stick, while the interior of the bodyportion at the opposite end is plain or cylindrical, as shown at 13, this being the end in which the blank or stick is first inserted, and in the section 2 of this end is arranged the knife, which may be made to project sufliciently within the body to cut the threads the desired depth. This knife consists of a stock 14 and a cutting edge or point 15, which in the example shown in the drawings is produced by forming a -shape channel or trough in the outerside of thestock and similarly beveling off the point of both sides of the inner end, as shown in Figs. 1 and 5.

The upper section 1 is recessed, as shown at 16, over the end of the knife, so as to permit the shavings to escape.

The knife is held in place by a clamp 17, which is secured to the side of the section 2 by means of a screw 18 or other suitable de- Vice, but preferably by adjustable means, so

that the knife may be readily loosened for sharpening or for adjustment, and in order that the point of the knife may be accurately adjusted laterally or lengthwise of the stick an adjusting-screw 19 is provided in the side of the section 2 in such a position as to impinge the side of the knife-stock above the point where the latter is engaged by clamp 17, said clamp, as better shown in Figs. 1 and 2, being provided with a hooked end 17, which laps around the back of the stock, so that the stock is held on two sides by its contact with the section 2 and on the other two sides by clamp 1.7 17?. In order that the position of the knife may be readily and accurately adjusted in a direction transverse to the axis of the stick, the section 2 is provided these two adjusting-screws 19 20 and the ICC cut by reason of the tangential arrangementv of the knife to the stick, While the other two,

adjustments lengthwise of the stick are essential for properly positioning the point of the knife with relation to the threads 12, it being obvious that should it be placed too far from the latter the end of the stick would be left blank, and consequently bind in said threads 12. By'means of the screw the knife may be forced away from the stick to change the depth of out without altering the tangential arrangement of the knife, and it is for this purpose that the screw 20 is positioned to impinge the stock of the knife at a point above the hook 17, it being understood, of course, that the adjustment is at no time very great, and the illustrated move ment or play between hook 17 and the knifestock will result in sufficient movement at the upper end of theknife.

Ordinarily the locking-lever 8 will be sufficient to hold the sections 1 2 against relative longitudinal movement; but if desired one of these sections may be provided with a dowel or steady pin 21 and the other with a socket 22 for receiving the same when the sections close together.

If desired, section 2 may be provided with any suitable handle 23 for holding it during 'the cutting operation.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is-

1. In a screw-cutting die the combination of an interiorly-threaded body portion forming a passage for the stick, a knife projecting into said passage, a clamp for holding said knife, and adjusting-screws engaging said knife on different sides for adjusting the knife, substantially as set forth.

2. In a screw-cutting die the combination of a body portion comprising two sections hinged together at one side and having a passage formed between them, said passage being threaded at one end and of plain cylindrical formation at the other end, a knife projecting into said plain portion of the passage, means for clamping said sections together, a hook-shaped clamp secured adjustably to one of said sections and embracing the knife on two sides and adjusting-screws impinging the knife on the other two sides, substantially as set forth.

3. In a screw-cutting die, the combination of a body portion comprising two sections hinged together and having a screw-threaded passage formed between them, a thread-cutting knife projecting into said passage and having a stock, an adjustingscrew arranged lengthwise of said threaded passage and impinging said stock on one side, a second atljusting-screw arranged crosswise of said passage and impinging said stock on a diagonally opposite side, and adjustable means for clamping said stock at a different point in its length from the point impinged by said screws, for resisting the movement of the stock by said screws.

4. In a screw-cutting die, the combination of a body portion having a threaded passage for the stick, a thread-cutting knife projecting into said passage and having a stock, means for adjusting said knife lengthwise of said passage in both directions, and means for adjusting said knife in a direction transversely of its stock at right angles to said first adjustment.

MARTIN R. MOBEOK.

Witnesses:

F. A. HOPKINS, M. B. ALLs'rAD'r, 

